The show said Bob McGrath, Emilio Delgado and Roscoe Orman will all leave the show

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(L-R) Roscoe Orman, Bob McGrath, and Emilio Delgado. The three longtime "Sesame Street" cast members are leaving the show.

There are three new openings on "Sesame Street."

The longrunning children's show is set to let go of three of its longtime senior cast members — Bob McGrath, Emilio Delgado and Roscoe Orman — E! News has confirmed.

But the three will continue to represent "Sesame Street" at public events, according to a statement issued Thursday.

"To us, and for millions of people worldwide, they are a treasured part of Sesame Street. Since the show began, we are constantly evolving our content and curriculum, and hence, our characters, to meet the educational needs of children," the statement said.

Sesame Workshop continues to keep creative control over the show, the statement said, adding "HBO does not oversee the production."

McGrath announced the departures during an event at the Florida Supercon in July, with TheMuppetCast podcast first reporting his statements. McGrath had been with the show since it premiered in 1969. Delgado joined the series in 1971 while Orman made his debut in 1974.

"As of this season, I have completed my 45th season this year. And the show has gone under a major turnaround, going from an hour to a half hour," the longtime star said. "HBO has gotten involved also. And they let all of the original cast members go, with the exception of Alan Muraoka--who is probably 20 years younger than the rest of us--and Chris Knowings, who is also young."

Last summer, HBO announced it would air the next five seasons of "Sesame Street" on the cable network's multiple channels, HBO Go, HBO On Demand and HBO Now before heading to PBS, with new episodes premiering in the fall of 2015.

"Our new partnership with HBO represents a true winning public-private partnership model," Jeffrey D. Dunn, CEO of Sesame Workshop, said in a statement. "It provides Sesame Workshop with the critical funding it needs to be able to continue production of Sesame Street and secure its nonprofit mission of helping kids grow smarter, stronger and kinder; it gives HBO exclusive pay cable and SVOD access to the nation's most important and historic educational programming; and it allows Sesame Street to continue to air on PBS and reach all children, as it has for the past 45 years."